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A092994
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Smallest prime of the form concatenation of prime(n) with itself followed by a 7, or 0 if no such prime exists.
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3
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227, 37, 557, 0, 11117, 137, 17171717171717171717171717171717171717171717171717177, 197, 23232323232323237, 29297, 317, 0, 41414141414141414141414141414141414141414141417
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(12)=0 since the concatenation of 37 with itself, followed by a 7, is always composite. a(14), the term relative to 43, is a prime with 1089 digits. - Giovanni Resta (g.resta(AT)iit.cnr.it), Apr 07 2006
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CROSSREFS
| Cf. A092992, A092993, A092995.
Sequence in context: A031603 A050847 A098247 * A031513 A078765 A179141
Adjacent sequences: A092991 A092992 A092993 * A092995 A092996 A092997
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 28 2004
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EXTENSIONS
| More terms from Giovanni Resta (g.resta(AT)iit.cnr.it), Apr 07 2006
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